1Department of Computer Engineering, Catholic University of Pusan, Busan, Republic of Korea2Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, Norway3Rikshospitalet, Oslo University Hospital, Oslo, Norway4School of Information Technology Engineering, Catholic University of Daegu, Gyeongsan, Gyeongbuk, Republic of Korea

Received 26 June 2014; Accepted 12 August 2014; Published 3 September 2014

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